Ninna (仁和) was a Japanese era name (年号, nengō, "year name") after Gangyō and before Kanpyō.
This period spanned the years from February 885 through April 889.
[1] The reigning emperors were Kōkō-tennō (光孝天皇) and Uda-tennō (宇多天皇).
[2]